The web search results mention the history and electronics nature of Sewoon Plaza (Makercity Sewoon), noting it was established in 1968 and was a major electronics hub. However, none of the provided evidence confirms the specific claim that 'Ha Sung-ki has sold large speakers to churches and event halls from his electronics shop in Seoul’s Sewoon Plaza for 42 years.' The claim is too specific to be verified by the general search results.

The evidence confirms that Sewoon Plaza is a historic electronics complex undergoing urban renewal and that the area is a focus of development (e.g., 'Sewoon Plaza, Reborn as Makercity Sewoon' and 'Seoul begins Sewoon District urban park project'). However, none of the provided sources describe the current atmosphere of the corridor as 'largely empty on weekday afternoons.' This specific observation cannot be corroborated.

The web search results discuss the general concept of building demolition for redevelopment or property value increase (e.g., '5 Reasons Why a Building Needs To Be Demolished'). While the search results mention redevelopment plans in general contexts (like Melbourne or Thornville), none of the provided evidence specifically links the belief that 'the building housing Ha Sung-ki's shop has been demolished due to redevelopment plans' to the actual situation at Sewoon Plaza.